化简求值答案(x³-2y³-3x²y)-[3(3x³-2y³)-4x&
化简求值答案(x³-2y³-3x²y)-[3(3x³-2y³)-4x&
先化简,再求值:(3x²y-2)×y-(9x的4次方y³-15x²y²)÷(3x
先化简,再求值:{xy(x²-3y)+3xy²}(-2xy)+x³y²(2x-y
化简求值:2(x-2y)^2-4(x-2y)+(x-2y)^2-3(x-2y),
初二化简求值题[(5x+2y)(3x+2y)+(x+2y)(x-2y)]/4x,其中x=2,y=3
化简求值{(x=2y)(5x-2y)-(3x+2y)(3x-2y)]/4x,其中x=2,y=-1
化简求值:(x+y)-(2x+1/2y)-(3x+1/6y)-(4x+1/12y)-(5x+1/20y)-.(10x+1
化简求值.(x-2y分之4xy 再加+x)除以4x³-x²y分之x²+4xy+4y
化简求值(2x+3y)平方-( 2x+y)(2x-y)
先化简再求值,3xy²(xy+2y²-x²)+3x³y²,其中x=2,
化简求值:【(x+2y)²-(x+y)(3x-y)-5y²]/2x,其中x=-2,y=二分之一详细过
化简下列各式,并求值:3(x-y)²-7(x-y)+8(x-y)²+6(x-y) 其中x=2,y